Typewriting machine



13, 1934- c. A. JOERISSEN TYPEWRITING MACHINE V 3 Sheets-Sheet 1Original Filed March 22. 1926 Feb. 13, 1934. c. A. JOERISSENTYPEWRITING- MACHINE Original Filed March 22, 1926 3 Sheets-Sheet '2Feb. 13, 1934. JOERISSEN A) I Re. 19,076

TYPEWRITING MACHINE Original Filed March 22. 1926 3 Sheets-Sheet 5gww'ntop Car/ JOZIILYJQH,

Reissued Feb. 13, 1934 UNITED STATES TYPEWRITING MACHINE Carl A.Joerlssen, Washington, D. 0.

Original No. 1,846,339, dated February 23, 1932, Serial No. 96,602,March 22, 1926. Application .for reissue December 15, 1933. Serial No.

The present invention relates to improvements in typewriting machines,and particularly to means whereby the operation of such a machine iseifected with a minimum amount of noise.

Particularly the object of the invention is to overcome theobjectionable noise produced by the type bars striking the platen and toprovide a key action whereby the type bars will be forced into printingrelation with the platen by a positive movement, securing clearimpressions, but

without forcibly striking the platen.

I am aware that it has been heretofore proposed to provide typewriterkey actions in which the noise produced by the type bars striking theplaten will be materially reduced, but by the present invention themovement of all the parts is positively effected through connectionswith the key lever, and without the necessity of employing auxiliaryparts for imparting movement to the type bars.

While the invention hereinafter described may be employed in connectionwith typewriting machines having type bars of various forms andsupported in different relations with regard to the printing roll orplaten, I have illustrated embodiments thereof in connection with a typeaction. in which the type bars are pivotally supported and adapted tomove upward and'rearward into printing relation with a relativelyelevated platen.

In the accompanying drawings:

Figure 1 is an elevation of a typewriter key action embodying thepresent invention, certain parts of the machine being shown in sectionand the type bar being in its normal inactive position.

Figure 2 is a similar view showing the position of parts when the keylever has been partly depressed and the movement of the type bar towardprinting relation with the platen checked.

Figure 3 is a simlar view showing the relation of the parts on thecompletion of the depression of the key lever and the movement of thetype bar into printing relation with the platen.

Figure 4 is a detail, on a slightly enlarged scale, of a portion of theconnection between the key lever and the type bar checking means.

Figures 5 and 6 are elevational views of a modification showing theparts, respectively, in the positions assumed when the type bar is atrest 50 and in printing relation to the platen.

Figures 7 and 8 are views, respectively similar to Figures 5 and 6, of aslightly modified form of key action, embodying the invention.

In the drawings many of the parts are shown 53 more or lessconventionally, and the views are,

28 Claims. (Cl. 197-25) to a considerable extent, diagrammatic. Therecan, of course, be material variation as regards proportions and sizesof the several parts. and also considerable modification in many of thedetails without departing from the invention. Except where specificallyreferred to in the appended claims, it is not intended to limit theinvention to the exact details shown, and the drawings are to beconsidered illustrative rather than restrictive of the invention.

In Figures 1 to 6 inclusive, I have illustrated the invention asembodied in a key action mechanism of substantially the type employed inthe well known Underwood typewriting machine'comprising a key lever 1fulcrumed at its rear end upon a rod 2, and extending throughslots in acomb plate or frameinember 3. The type bar 4 is pivotally mounted upon arod 5, which is of are shape so that the .several type bars of themachine lie in the form of a transversely curved basket.

Movement of the key lever 1 is transmitted to the type bar 4 by asub-lever 6, fulcrumed at '1 on the machine frame. When the forward,outer, end of the key lever 1 is depressed, the type bar 4 will becaused to swing upward and rearward about its pivot 5 into printingrelation with the platen 8 and the usual type guide 9 in the manner wellunderstood.

In the drawings I have only illustrated a single key action, and it willbe understood that this is to be duplicated throughout the series oftype bars in the ordinary manner. I

10 designates a link which is pivotally supporte at an intermediatepoint of its length, and has one end connected to the type bar 4. Asshown, the pivot 11 of the link 10 is carried by a pivotally mountedfulcrum support 12, which is supported to rock about an axis 13extending through the members of a depending comb plate or frame section14. The fulcrum support 12 is provided with a forward extension 15 thatengages a link or rod 16 extending upward from and pivotally connectedat its lower end to the key lever 1.

The link or member 10 is eccentrically mounted on the fulcrum support12, and it will be seen that as the type bar swings upward from itsnormal inactive position represented in Figure Lto the substantiallyvertical position shown in Figure 2, such member will be brought intosuch relation to the axislB of the fulcrum support and said bar as tocheck the swinging movement of the type bar just prior to its cominginto contact with the platen.

The engagement of the link or rod 16 with the extension 15 of thefulcrum support 12 will, 0

as the key lever continues to move downward from the position shown inFigure 2, cause a bodily rocking of the fulcrum support about the axis13, thus moving the connecting member 10 in the direction of its lengthand positively foreing the type bar toward the platen, completing itsmovement into printing relation therewith.

As shown in Figures 1 to 3, the stem of the type bar 4 is provided witha longitudinally extending slot 441 into which projects a pin or stud atthe inner end of the link or checking member 10, and a spring 17connects the checking member 10, at the opposite side of its fulcrumllfrom the type bar, with the connecting link or rod 16 that extendsupward from the key lever 1. The outer end of the link or checkingmember 10 may be slightly weighted, as indicated at 10a, so that thismember will offer practically no resistance to the initial upward andrearward swinging movement of the type bar.

As shown, the link or connecting rod 16 has formed therein adjacent itsupper end a longitudinal slot 16:; which receives a pin projectinglaterally from the forward extension 15 of the pivotally mounted fulcrumsupport 12 and these parts are so related that the upper end of saidslot 16a will engage said' pin on the fulcrum support substantially atthe moment that the movement of the type bar into printing relation withthe platen is checked as before described, at which time the connectionof the checking member 10 with the type bar and the fulcrum 11 are insubstantial horizontal alignment with the axis 13 of the fulcrumsupport.

Therefore, while the movement of the type bar toward printing relationwith the platen will be checked there will be no material interferencewith downward movement of the key lever and the completi on of themovement of the type bar into printing'relation with the platen will beeffected by a positive forceexerted'by pull of the link 16 on theextension-15 and a consequent movement in the direction of the length ofthe I connecting member 10.

A spring 20 may be interposed between a portion of the typewriter frameand the extension 15 of each fulcrum support to assist in returning theparts to normal position, the machine, of course. including the usualsprings 21, for lifting the key levers after the same are relieved frompressure. As shown, the key levers 1 are of the common form includingtwo pivotally connected sections having a ,coil spring Ill interposedbetween them, whereby the checking of the upward and rearward swingingmovement of the type bar will not interfere with the downward movementof the key and outer end of .the key lever through the required stroke.

If desired, each fulcrum support 12 may be 50' provided with a shortlateral projection 12a,

which will extend over the upper edge of the checking member 10 when theparts are in the position shown in Figures 2 and 3, and, under the pullexerted by the spring 20 will assist in starting the turning movement ofsaid checking member about its fulcrum so that it will not in any, wayinterfere with the return of the type bar to its normal inactiveposition.

In the embodiment of the invention illustrated io-in Figures 5 and 6,the means for checking the movement of the type bar toward printingrelation with the platen includes a toggle, one member 30 of which isfulcrumed on the pivotally mounted fulcrum support 12, and the othermeme i; ber 31 of which is pivotally connected to the type bar 4. Theforward end of the toggle member 30 is connected by a link 32 with alever 33, which is arranged below the plane of'the key lever 1, and isadapted to be rocked about its fulcrum 34 by the movement of adownwardly extending arm 6a of the sub-lever 6.

With this arrangement it will be seen that as the type bar moves fromits normal inactive position shown in Figure 5 upward and rearwardtoward the platen 8, the members 30, 31, of the toggle will come into asubstantially straight line relation, thus checking the movement of thetype bar, and when the fulcrum support 12 is rocked about its pivotalaxis the toggle will exert a positive push upon the type bar, completingthe movement thereof into printing relation with the platen. The finaloperative swing of the fulcrum support is permitted by the pin of thepin and slot connection betweenmembers 6a and 33 com ing under theupward enlargement at the right end of the slot (Fig. 6). v a

That part of the fulcrum support between its swinging axis and the screw11 constitutes a link portion swingable downwardly from its normalposition of rest anctrearwardly to complete the stroke of the type bar.The fulcrum support being thus normally poised; its inertia is overcomewith the least possible effort. Spring la in straightening the key barmoves link 16 upwardly to restore the fulcrum support, the usual key barreturn spring assisting in this action.

A suitable stop 30a may be provided about the pivotal connection betweenthe toggle members 30, 31. to prevent any possibility of this connectlever 1 and the lever 33, so that the initial depression of the keylever will actuate the lever 33 and through its connection with the typebar.

swing the latter into alignment with the type guide 9 and the platen 8.

The extent of movement permitted the lever I 33 is such that swingingmovement of the type bar will be checked as said bar comes intosubstantial alignment with the axis of the fulcrum support 12 and thepivotal connection of the bar with said support.

The length of the type bar is such, and it is so related to the otherparts, that with the several members in the relation described theprinting head on the type bar will not touch the platen. However, as thefulcrum support 12 is rocked by the positive pull exerted through theconnection 16, as the downward movement of the key lever continues, thetype bar will receive,a slight movement substantially in the directionof its length which will complete the movement of said bar into printingrelation with the platen.

It is believed that the operation and advantages of the invention willbe readily understood from the foregoing description in connection withthe drawings. It will be seen that the invention provides a very simplevmeans for preventing the sudden striking of the type bars against theplaten, which is the cause of the objectionable noise incident tooperating such machines. By the arrangement of parts described, themovement of the type bar into printing relation with the platen ischecked and the completion of such V movement is caused by a positiveconnection be- 1 of a toggle, as illustrated in Figures-5 and 6, is

interposed between the fulcrum support and the type bar or the latter ispivotally connected directly to said support the turning of said supportwhich eiTects the completion of the type bar movement to printingrelation with the platen is due to a positive connection with the keylever.

In the drawings I have illustrated a key action located approximately atthe middle, transversely,

of the machine and wherein the link connections 16 and 32 may beperfectly straight, one piece, elements. The corresponding parts ofkeyactions situated at or nearer the ends or sides of the type barbasket will, of course, have to be slightly modified, the exact form ofeach said connection depending upon the location of the particular keyaction in the machine.

However,.in all instances there is a positive connection between the keylever and the fulcrum support for the checking means for rocking saidsupport and effecting a movement in the direction of the length of saidmeans for effecting completion of the movement of the type bar toprinting relation to the platen.

Having thus described the invention, what is claimed as new is:

I claim:

1. In a typewriting machine, the combination of a platen, a key lever, atype bar movable tm and from printing relation with the platen, meanscontrolled by actuation of the key lever for effecting initial movementof v the type bar toward the platen, means for checking the movement ofthe type bar toward the platen including a pivotally mounted memberconnected to the type bar, and meansfor connecting the key lever andsaid pivotally mounted member during a portion of an operative movementof the key lever for positively moving said member to effect completionof a movement of the type bar toward the platen.

2. In a typewriting machine, the combination of a platen, a depressiblekey lever, a pivotal type bar mounted to swing upward and rearward intoprinting relation with the platen, means controlled by actuation of thekey lever for effecting initial movement of the type bar toward theplaten, means for checking the movement of the type bar toward theplaten including a pivotally mounted member connected to and extendingforward'from the type bar, and means for establishing a connectionbetween the key lever and said pivotally mounted member for positivelymoving said member to effect completion of a movement of the type bartoward the platen.

3. In a typewriting machine, the combination of a platen, a key lever, atype bar movable to and from printing relation with the platen, meanscontrolled by actuation of the key lever for. effecting initial movementof the type bar toward the platen, means for checking the movement ofthe type bar toward the platen prior to its coming into printingrelation to the platen including a member pivotally supported in advanceof the platen and connected to the type bar, and means connected withthe key-lever for moving said member about its pivotal support, afterthe move. ment of the type bar has been checked, to effect completion ofa movement of the type bar to printing relation with the platen. Q

4. In a typewriting machine, the combination of a platen, a dep'ressiblekey lever, a type bar movable to and from printing relation to theplaten, means controlled by depression of the key lever for efiectinginitial movement of the type bar toward the platen, means for checkingsuch movement of the type bar including a member connected to said barand extending at an angle to the length of the bar when its movementtoward the platen is checked, and means including a member extendingupward from the key lever for positively actuating said first mentionedmember to effect completion of movement of the type bar into printingrelation with the platen. I

5. In a typewritingmachine, the combination of a platen, a depressiblekey lever, a type bar movable to and from printing relation to theplaten, means controlled by depression of the key lever for efiectinginitial movement of the type bar toward the platen, means for checkingsuch movement of the type bar including a member connected to said barand extending substantially at right angles to the length of the barwhen its movement toward the platen is checked, and means adapted to bepositively actuated by the key lever for imparting a substantiallylongitudinal movement to said memher to effect completion of movement ofthe type bar into printing relation to the platen.

6. In a typewriting machine, the combination of a platen, a key lever, atype bar movable to and from printing relation with the platen,

means controlled by actuation of the key lever for effecting initialmovement of the type bar toward the platen, means for checking themove-- ment of the type bar toward the platen, prior to and including apivotally mounted member connected to the type bar, andsupplemental-means connected with the key lever and adapted topositively rock said pivotal member during the later portion of anoperative movement of the key lever to effect completion of movement ofthe type bar into printing, relation to the platen.

7. In a typewriting machine, the combination of a platen, a key lever, atype bar movable to and from printing relation with the platen, meanscontrolled by actuation of the key lever for effecting initial movementof the type bar toward the platen, means for checking the movement ofthe type bar toward the platen including a pivqtally mounted memberconnected to the type bar, a piyotally mounted fulcrum support for saidmember, and means for connecting the key lever and said; fulcrum supportwhereby downward movethe platen, means for checking the movement of thetype bar toward the platen including a piv otally mounted memberconnected to the type bar, a pivotally mounted fulcrum support for saidmember, and a rod extending upward from the key lever and adapted as thekey is depressed beyond the position assumed when movement of the typebar toward the platen is checked to engage and positively rock thefulcrum support to move said member in the direction of its length toeffect completion of movement of the type bar into printing relation tothe platen.

9. In a typewriting machine, the combination of a platen, a depressiblekey lever, a pivoted type bar adapted to swing upward and rearward intoprinting relation to the platen, a sub-lever interposed between thekey-lever and type bar and adapted to effect initial movement of thetype bar toward the platen as the key lever is depressed, means forchecking such movement of the type bar including a member connected tothe type barand extending substantially horizontally therefrom whenmovement of the type bar is checked, and a rod extending upward from thekey lever and adapted, as said-lever is depressed beyond the positionassumed when movement of the type bar is checked, to move said member inthe direction of its length to eflect completion of the movement of thetype bar to printing relation to the platen. v v

10. In a typewriting machine, the combination of a platen, a'depressible key lever, a pivoted type bar adapted to swing upward andrearwardinto printing relation to the platen, a sub-lever interposedbetween the key-lever and type bar and adapted to efiect initialmovement of the type bar toward the platen as the key lever isdepressed, means for' checking such movement 'of the type bar includinga pivotally mounted member connected to the type bar and projectinglaterally therefrom when movement of the type bar is checked, a pivotalfulcrum support for said member, and means actuated by depressing theikey lever beyond the position assumed when movement of the type bar ischecked for positively moving the fulcrum support of said mem-' be: tocause the latter to eflfect completion of movement of the type bar intoprinting relation to the platen.

11, In a typewriting machine, the combination of a platen, a key lever,a type bar movable to 46 and from printing relation with the platen,means controlled by actuation of the key lever for elf-'- iectinginitial movementvof the type bar toward the platen, means for checkingthe movement of the type bar toward the platen prior to its coming intoprinting relation to the platen and including a pivotally mounted memberconnected to the type bar, and a connecting means extending upward fromthe key lever and adapted as the key lever is depressed beyond theposition assumed when movement of the type bar is checked to engage andpositively rock said pivotally mounted member to effect completion oi.

movement 01' the type bar to printing, relation to the platen.

12. In a typewriting machine, the combination of a platen, a key lever,apivotally mounted type bar, means controlled by actuation of the keylever for effecting initial swinging movement of the type bar toward theplaten, means connected to and moving with the type bar for checkingmovement of such bar toward the platen prior toits coming into printingrelation to the platen and supplemental means positively actuated'by thekey lever, after the movement of the type bar has been checked, foreil'ecting completion of movement of the type bar to printing relationto the platen in a substantially straight line direction.

13. In a typewriting machine, the combination of a platen, a key lever,a type bar. movable to 14. In a typewriting machine, the combination ofa platen, a key lever, a type ibar movable to and from printing relationwith the platen, means controlled by actuation of the key lever foreffecting initial movement of the type bar toward the platen, means forthe checking the movement of the type bar toward the platen, including apivotally mounted member connected to the type bar, and supplementalmeans connected with the key lever and adapted to positively shift thefulcrum of said pivotal member during the latter portion of an operativemovement of the key lever to move said member in the direction of itslength to ell'ect completion of movement of the type bar into printingrelation to the platen.

15. In a typewriting machine, the combination of a platen, a typecarrier mounted to swing upward to printing relation to the platen,means for checking movement of the type carrier toward the. platen priorto the carrier coming into printing relation to the platen including api'votally mounted member which remains stationary until said movementof the type carrier is checked and is thereafterbodily rocked to eifectcompletion of movement of the type carrier to printing relation to theplaten, a key lever, and means actuated by operation of the key leverfor eflecfing successively movement of the type carrier and saidpivotally mounted member. .18. In a typewriting machine, the combinationor a platen, a depress'ible key lever, B. type bar movable to and fromprinting relation with the platen, means controlled by depression of thekey lever for effecting movement of the type bar toward the platen,means for checking such move-' 3 ment of the type bar prior to itsreaching printe ing relation with the platen, including a pivotallymounted member connected with the type bar, and means, actuated bymovement of the key lever after the movement of the type bar has beenchecked, for rocking said pivotally mounted member to efiect completionof movement of the type bar into printing relation to the platen.

17. In a typewriting machine, the combination .of a platen, a key lever,a pivotally mounted type bar movable to and from printing relation withthe platen, means controlled by actuation of the the key lever after themovement of the type bar has been checked, for rocking said pivotalmemher and eflecting completion of the movement of the type bar towardsthe platen.

18. In a typewriting machine, the combination or a platen, .a'key level,a type bar movable to and from printing relation with the platen, meansactuated during the first portion of an opera tive movement of the keylever for eflecting movelrl ment of the type bar toward the platen,means for checking movement of the type bar toward the platen prior tothe bar coming into printing relation to the platen, and including amember connected to the type bar and pivotally supported in advance ofthe platen, and supplemental means, actuated by the key lever after themovement of the type bar has been checked, for rocking said pivotallymounted member to effect completion of the movement of the type bartoward the platen.

19. In a typewriting machine, the combination of a platen, a depressiblekey lever, a pivoted type bar, means controlled by depression of the keylever for effecting movement of the type bar toward the platen, meansmovable with the type bar for checking such pivotal movement of the typebar prior to the bar coming into printing relation to the platen, andsupplemental means providing a positive connection between the key leverand type bar, after such movement of the type bar has been checked, andeffecting completion of the movement of the type bar toward the platen.

20. In a typewriting machine, the combination of a platen, a typecarrier movable to and from printing relation with the platen, and meansfor moving the type carrier into printing relation to the platenincluding a normally collapsed tog- .gle, the straightening of whichacts to check movement of the type carrier prior to the latterscontacting with the platen, and means for moving the togglesubstantially in the direction of its length to complete the printingmovement of the type carrier.

21. In a typewriting machine, the combination of a platen, a typecarrier movable to and Irom printing relation with the platen, and meansfor moving the type carrier into printing relation to the platenincluding a normally collapsed toggle, the straightening of which actsto check movement of the type carrier prior to the latter's contactingwith the platen, and a rocking member connected with and adapted tosupplement the action of the toggle to complete printing movement of thetype carrier.

22. In a typewriting machine, the combination of a platen, a typecarrier movable to and from printing relation with the platen, and meansfor moving the type carrier into printing relation to the platenincluding a normally collapsed toggle, one member of which is adapted tomove the type. carrier as the toggle (is expanded, a pivotally mountedsupport for the other toggle member, and means whereby the support isrocked to supplement the actionof the toggle in completing printingmovement of the type carrier.

23. In a typewriter, a type bar pivoted for an upward and rearwardoperative swing, a toggle comprising two pivotally connected members ofwhich one has a pivotal connection with the type bar, a swingable link"portion having a pivotal connection with the other or said togglemembers, said link portion being swingable downwardly'from its normalposition of rest and rearwardly, a key bar operable to move the togglemembers from a normally collapsed downwardly extending position to arelatively straightened position and to impart to the type bar aterminally checked throw to a position slightly in advance of strikingposition, and means thereupon eflective to operatively swing said linkportion to complete the stroke of the type bar through said toggle.

24. In a typewriter, a type bar pivoted for an said link portion beingswingable downwardly from its normal position of rest and rearwardly, akey bar having a connection with said toggle and operable to move thetoggle members from a normally collapsed downwardly extending positionto a relatively straightened position and to impart to the type bar aterminally checked throw to a position slightly in advance of strikingposition, and means external of said connection thereupon effective toswing said link portion to complete the stroke of the type bar throughsaid toggle.

25. In a typewriter, a type bar pivoted for an upward and rearwardoperative swing, a toggle comprising two pivotally connected members ofwhich one has a pivotal connection with thetype bar, a swingable linkportion having a pivotal connection with the other of said togglemembers, said link portion being swingable downwardly from its normalposition of rest and rearwardly, a key bar operable to move the togglemembers from a normally collapsed downwardly extending position to arelatively straightened position and to' impart to the type bar aterminally checked throw to a positionslightly in advance of strikingposition, means thereupon efiective to operatively swing said linkportion to complete the stroke of the' type bar through said toggle, andpowerstoring means tending to restore said link portion.

26. In a typewriter, a type bar pivoted for an upward and rearwardoperative stroke, a toggle comprising two pivotally connected members ofwhich one has a pivotal connection with the type bar, a swingable linkportion having a pivotal connection with the other of said togglemembers, said link portion being swingable downwardly from its normalposition of rest and rearwardly,-

a key bar having a connection with said toggle and operable to move thetoggle members from a normally collapsed downwardly extending positionto a relatively straightened position and to impart to the type bar aterminally checked throw to a position slightly in advance of strikingposition, means. external of said connection thereupon eflective toswing said link portion to complete the stroke of the type bar throughsaid toggle, and power-storing means tending to restore said linkportion.

27. In a typewriter, a type bar pivoted for an upward and rearwardoperative stroke, a toggle comprising two pivotallyconnected members oi.which one has a pivotal connection with the type bar, a swingable linkportion having a pivotal connection with the other of said togglemembers, said link portion being swingable downwardly from its normalposition of rest and rearwardly, a key bar having a connection with saidtoggle and operable to move the toggle members from a normally collapseddownwardly extending, position to a rela-- tively straightened positionand to impart to the type bar a terminally checked throw to a positionslightly in advance of striking position, said connection includingmeans acting onthe type bar exclusively'of the toggle during saidterminally checked throw, and means external of said connectionthereupon efiective to swing said link portion to complete the stroke ofthe type bar through said toggle. L

28. In a typewriter, a type bar pivoted for an upward and rearwardoperative stroke, a toggle comprising two pivotally connected members 01which one has a pivotal connection with the type bar, a swingable linkportion having a pivotal connection with the other of said togglemembers, said link portion being swingable downwardly from its normalposition 01' rest and rearwardly, a key bar having a. connection withsaid toggle and operable to move the toggle membersifrom a normallycollapsed downwardly extending position to a relatively straightenedposition and to impart to the type bar a terminally checked throw to aposition slightly in advance oistriking position, said connectionincluding means acting on I the type bar exclusively of the toggleduring said terminally checked throw, means external of said connectionthereupon effective to swing said link portion to complete the stroke ofthe type bar through said toggle, and power-storing means tending torestore said link portion.

CARL A. JOERISSEN,

